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19 amazing places you can't actually visit

Two bikers were reportedly accosted by armed military personnel after straying into Nevada's top-secret Area 51 Air Force Base – and managed to capture the entire encounter on video. Not the ideal outcome of a US road trip holiday, granted, but then even the silliest tourist might expect some repercussions from straying into highly-classified government territory.*

There are more off-limits places in the world than you might expect. There are now 65 Unesco World Heritage sites – and countless other attractions and national parks – where British travellers are banned. In addition to Area 51, here are some more of the most notable...

*If you do fancy a rummage around Nevada's Area 51, which many say harbours an alien research facility, you would be wise to confine your explorations to the Alien Research Center, a tourist attraction at the southern end of Highway 375 (aka Extraterrstrial Highway) – pictured above.